Iris germanica 'Midnight Oil'
I've just begun to be fascinated with 'black' flowers. In most cases the flowers are not black but dark enough to make you think they are.
Iris 'Midnight Oil' is a deep deep shade that at first sight appears black. The buds, look to me, to really be black. The open flowers however reveal a glorious mix of deep shades of purples and maroons. Midnight never looked so good!